This may be the only time we've seen the Queen wear a trouser suit. She looked smart in the grey two-piece when leaving hospital in 2003. Her Majesty had an injured knee and was possibly dressing to cover it.

How many times have you seen the Queen step out in a pair of trousers? Not many. In fact, the Queen hasn't worn trousers in public for nine years.

The Monarch favours dresses or skirts for her formal engagements, and is known for her love of bright colours with matching hats and coats. When the Queen has decided to wear trousers, it is normally during her private time for leisure activities, sport or on holiday.

According to tradition, royal women usually wear skirts or dresses while on duty. The Duchess of Cambridge seems to follow the Queen's lead with this and is rarely pictured in trousers. Duchess Meghan, meanwhile, has taken more of a modern stance and has already worn trousers on official engagements with Prince Harry.

Here we see a young Princess Elizabeth, then aged 14, with her sister Princess Margaret back in 1940 at Windsor Castle. The pair looked very stylish in their jodhpurs, which taper at the calf, as they picked daffodils.

Click through the photo gallery to see all the times the Queen has worn trousers…